The 2GIG Doorbell is a dual-purpose doorbell that can be installed with the dwelling’s existing 24 V wiring or using the 345 MHz radio frequency:

Wired Installation. When installed as a wired doorbell with the home’s existing 24 AC wiring, the bell is fully water-resistant and the push button remains illuminated.

Wireless Installation. When installed as a wireless doorbell, it features a fully water-resistant button. It communicates with the control panel using the 345 MHz frequency. The push button does not remain illuminated.